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MathGroup Archive 2005

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Re: Baffling change to partial derivative in version 5.1

  • To: mathgroup at smc.vnet.net
  • Subject: [mg61571] Re: [mg61555] Baffling change to partial derivative in version 5.1
  • From: Chris Chiasson <chris.chiasson at gmail.com>
  • Date: Sat, 22 Oct 2005 03:24:10 -0400 (EDT)
  • References: <200510220435.AAA06268@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

lol
I verified it. You are sane.
I wonder why this is broken... btw, I think you should send this to
WRI support as a bug report.

Version Number: 5.2.0.0
Platform: Windows
Registered Name: Chris Chiasson
Organization:

In[1]:=
??time

From In[1]:=
\!\(\*
  RowBox[{\(Information::"notfound"\), \(\(:\)\(\ \)\), "\<\"Symbol \
\\!\\(\\\"time\\\"\\) not found. \\!\\(\\*
      ButtonBox[\\\"More?\\\", ButtonStyle->\\\"RefGuideLinkText\\\", \
ButtonFrame->None, ButtonData:>\\\"General::notfound\\\"]\\)\"\>"}]\)

In[2]:=
D[x y,time,NonConstants\[Rule]{x}]

Out[2]=
0

On 10/22/05, Steven HANCOCK <Steven.Hancock at cern.ch> wrote:
> Please, can anyone explain (or even just reproduce) the following behaviour?
>
>
> In[1]:=
> $Version
>
> Out[1]=
> 5.1 for Microsoft Windows (October 25, 2004)
>
> In[2]:=
> $ReleaseNumber
>
> Out[2]=
> 0
>
> In[3]:=
> D[x y, t, NonConstants->{x}]
>
> Out[3]=
> y D[x, t, NonConstants -> {x}]
>
> In[4]:=
> D[x y, time, NonConstants->{x}]
>
> Out[4]=
> 0
>
>
> Merely changing the spelling of the variable from t to time does not
> return zero in version 4.2.
>                              Thanks, Steve.
>
>


--
Chris Chiasson
http://chrischiasson.com/contact/chris_chiasson


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